Plans showing proposed off-street parking layout and landscaping for churches and schools shall be submitted to and approved by the city building official prior to the issuance of a building permit. Said plans shall provide that all land not covered by buildings or by off-street parking space shall be landscaped as lawn, trees, shrubs, gardens, or ground cover and otherwise landscaped and maintained in accordance with good landscaping practice. Only 25 percent of the required front yard setback space shall be used for automobile parking, and the rest shall be landscaped and maintained with lawn, trees, shrubs, or ground cover.